Thanks, those are great links.
I looked up the standard we design to, EN 60335-1 but its definitions could be interpreted many ways. It talks of an acceptable rise above ambient of 60K for motor-operated appliances, but doenst have details on heating appliances or boilers.
Heres another link...
What is the maximum permissible surface temperature for a self service water boiler intended for customer use in shops? The lid is stainless steel and gets to about 60C.
It will only be sold/used within the EU and is to be CE marked.
Thanks for the info. The highest temp I am going to see is 121C in a pressure boiler at 15psi. Scale is an issue in our boilers. I have read that incoloy allows for a shorter length of heating tube but this will lead to more concentrated scale per unit length. In the past we have used copper...
I am trying to source submersible elements for catering water boilers. I wanted incoloy 800 but am finding difficulty in getting them at a good price. I have been offered incoloy 840 or 316s/s. All I can find about 840 is that it is an incoloy alloy suited to welding so has it poorer properties...
